Finding the Fourth Proportional to 1,216.32, 1,677.81 and 920.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.32 : 1,677.81 = 920.67 : x
2. Step 2: Convert to fraction form
   1,216.32/1,677.81 = 920.67/x
3. Step 3: Cross multiply
   1,216.32x = 1,677.81 × 920.67
4. Step 4: Simplify right side
   1,216.32x = 1,544,709.33
5. Step 5: Solve for x
   x = 1,544,709.33/1,216.32
6. Step 6: Final answer
   x = 1,269.99